JPS6196303A - Method and device for feeding water to forced circulation boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water supply device for forced circulation boilers. More specifically, the present invention relates to a control device for a positive displacement water pump and a method for supplying water to a forced circulation boiler.

BACKGROUND OF THE INVENTION Conventional boilers for steam generation include a smoke tube type in which combustion gas circulates through a tube immersed in a water container, and a forced-feed type in which water circulates in a tube exposed to the combustion gas. In the smoke tube type, the water level within the vessel is usually controlled by a simple float valve. However, in the forced feed type, water is transferred in the pipe by a pump of IvM or higher or at a rate corresponding to the steam demand rJl. Controlling the water feed rate to such boilers is difficult due to the high pressure of the water feed and often high temperatures when condensate from the steam separator is returned to the pump inlet.

A forced circulation boiler system producing steam at variable speed: ζ1- requires means for controlling the heat sources, i.e. the fuel and air supplied to the burner, and means for controlling the water supplied to the heating coils. . Controlling the fuel with a known 5M valve and the air with a known damper is easier than controlling the amount of water supplied to the boiler. Both variable displacement claw pumps and constant displacement pumps have been used for water supply, and constant displacement bonnobu pumps have the advantage of producing a defined output even under varying pressure conditions.

Diaphragm pumps, in which an electric motor drives a reciprocating piston within the pump housing, which in turn transfers hydraulic fluid against a flexible diaphragm that moves the water, supply water to forced circulation boilers. known to be particularly suitable for The individual pump members (piston and frinzo) are disabled via solenoid bypass valves,
Increments related to the number of pump members, for example, if the pump members are 4g, 3/4.1/2. of the pump output. or l
/4 controls the pump output. A tubular column of water separates the pump head or diaphragm from a check valve located between the inlet and outlet manifolds to isolate the diaphragm from excessive temperatures.

If the required amount of water, e.g. 60% of the total pump output, cannot be achieved by disabling one or more pump components, the water bypass valve can be operated to direct some of the water to the pump inlet. I have to go back.

A water bypass valve should function as a regulating valve to accurately dispense the required amount of water.Such bypass valves are prone to leakage and are prone to scale sinking and l? Requires considerable maintenance work due to wear and tear.

Instead of a bypass valve for water, when the steam pressure reaches a certain value, the water, ljI! Step controls have traditionally been used to control steam output by completely or partially blocking the flow of water and air, and then allowing water, fuel and air to flow again when the steam pressure has decreased to a second value. It's here. Although such step controllers are less expensive than fully adjustable controllers, they do have several drawbacks.

First, the steam pressure can vary over a considerable range.

Second, if fuel is completely shut off, the combustion chamber must be purged of residual gas and fuel before reburning. A small boiler, ie, a boiler with a horsepower of 100 to 200, requires only a few seconds of prepurge time, but a large boiler with a horsepower of 500 horsepower or more requires a prepurge time of several minutes. Such a large time delay causes an extreme drop in steam pressure.

A further alternative to water bypass valves is hydraulically actuated diaphragms that control the movement of individual diaphragms (and thus the amount of water pumped) by varying the amount of hydraulic fluid delivered to the diaphragms. pumps have been used. This type of pump is described in U.S. Patent No. 3,972.
．． It is described in No. 654. Although these pumps have been effective in accurately controlling the amount of water delivered and eliminating the problem of water bypass valve leakage, they are expensive to manufacture.

These drawbacks of conventional feedwater control devices for forced circulation boilers are overcome by the present invention.

SUMMARY OF THE INVENTION An apparatus according to the invention includes a positive displacement pump that further includes a water inlet, an outlet, and a plurality of separate pump members. Each pump member pumps a predetermined amount of water from the water inlet to the outlet during each cycle of the pump. The disabling means, in conjunction with the six pump sections 1o, selectively disables the pumping action of the associated pump sections t.

The invention further includes control means. The control means is linked to the water supply demand to the boiler within a set range, and has an operation cycle that changes according to the water supply demand (i.e., pumping time divided by l cycle time - f binary value), and At least one of the disabling means is controlled to selectively disable the pumping action of the associated pump member at a predetermined periodic rate.

According to the method according to the invention, fuel is continuously supplied to the burner of the boiler, and the outflow of fuel is monitored,
The flow rate of water across two boilers is determined. A positive displacement pump comprising a plurality of separate pump members is operated to supply water to the boiler. Also, there are a few pump parts.
are disabled periodically and in variable cycles of operation related to water demand.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, one embodiment of which will be described.

The present invention relates to a water supply control device for a forced circulation boiler and a method for supplying water to the boiler. In FIG. 1, the apparatus of the invention comprises a water tube boiler 10 with a water inlet 12 and a steam outlet 14. A lower part of the boiler 10 surrounds a combustion chamber 16. The burner 18 is located at the lower end of the boiler, and has a nozzle 20 for atomizing fuel oil.
and a spiral end portion 22 that protrudes upward into the interior of the tube boiler. The air for atomizing the fuel is
It is supplied via conduit 24 from a suitable source (not shown). Oil is supplied to the burner 18 via the supply line 26 and the fuel control valve 28 from a suitable source of pressurized oil (not shown) connected to the control valve 28 end 30 of the supply line.
supplied to

This fuel regulating valve 28 is assigned to the assignee of the present invention.
It is illustrated in FIG. 3 of U.S. Pat. No. 3,972,654. This valve 28 is equipped with a servo motor 32,
It controls the rotational position of the cam plate 34, the linear position of the valve stem 36 by means of a cam follower (not shown), and the wipcr position of the potentiometer 13 shown in FIG. The valve stem controls the flow of water through the tube 26 depending on the position of the cam plate 34. The servo·
The motor 32 may be controlled by an operator using, for example, a potentiometer, or may be partially a feedback system responsive to the amount of force required by the boiler.

The function of the servo motor 32 and regulating valve 28 is to precisely control the flow of oil into the burner to provide the heat necessary to produce the desired or required amount of steam. The function of the potentiometer 43 is to provide a control signal to a device for supplying water to the boiler 10, as will be explained later in connection with FIG.

A blower device 38 supplies air to the combustion chamber 16 through a conduit 40 . air conditioning damper blade
blade) 42 connects coupling device 4 to control the amount of air entering the combustion chamber in response to the flow of oil through valve 28.
Connected to cam plate 34 by 4
1 has been done.

The steam exiting from the outlet 14 of the 1+nM coil or boiler IO is transferred to a pressure vessel.
The steam water is led to a #I vessel 46 equipped with a separation nozzle 48 in the vessel 50 . - This J Qi is released from the outlet 52. A steam trap 54 returns excess water (condensate) from the separator to a hot water sump (not shown) and then to the inlet manifold 56 of the water pump 58. trap 54
is provided with a valve 57 that opens periodically to return the incoming volume of condensate to the hot water sump or pump inlet manifold 56.

Now, in FIGS. 1, 2, and 3, the pump 58 has four cranks 62.64, 66.68, and four cranks of suitable length.
A canong 60 is provided with a pressure well or a crack chamber 69 filled with a well. Pistons 62a, 64a,
66a and 68a are suitable connections [!] as shown in the figure. It is connected to the crankshaft 70 by a throat. The crankshaft is mounted in bearings 72, 74. Kodashi Noyafuto 76 with helical spur tooth medium 78,
Extending into casing 60. The spur tooth medium 78 drives the main gear 80 fixed to the crankshaft 70. The drainage chambers G2b, 64b, 6Gb, 68b are
Each is linked to a crank 62, 64, 66, 68.

As shown in FIG. 73, each water chutuba includes a housing 89 and a flexible diaphragm 90. This flexible diaphragm is pressed against a first note 92 in the pump casing 60 by means of a coil I]94. As shown in FIG. 3, hydraulic chamber 96 is connected to the bottom of crank 62 by a port.

When piston 62a is in its highest position, fringe 62 receives oil from crankcase 69 through opening 99. As the piston 62 descends, it is forced into the hydraulic chamber 96 and the diaphragm 90 moves towards the nozzle 102 in the water nozzle 89, thereby compressing the spring 94 and causing the water in the water chamber 104 to move. The water is forced upward into the water tower 106. This water flows through check valve 1
08 into the outlet manifold +10 and further into the tubular inlet 12 of the foiler. As shown in FIGS. 1 and 3, water flows from the inlet Romanifold +12 to the check valve 11.
4 to a water chamber 104 and a water tower 106. Water chambers 64b, 66b.

68b is also similar to chamber 62b just described.

It consists of a cylindrical hole +17, and a valve core (v
Bypass valve 116 selectively bypasses oil from crank 62 back to crankcase 118, as described below, thereby allowing oil to flow through crank 62. This is to nullify the pumping action of the pump member consisting of the piston 62a and the water chamber 62b.

Bypass valve 116 connects opening 98 and hydraulic chamber 96 to crankcase 69 via passage 120 . Bypass rod 122 connects valve core 11
B and the air crank +24. The air cylinder 124 has a cylindrical enclosure.
e) and an actuation piston 128 and a return spring 130. Valve 182 shown in FIG. 5, as explained below.
air inlet (air 1) for receiving pressurized air from
nfetline) 182a is provided in the enclosure.

Hydraulic piston and crank combination U゛ 64/64, respectively
a, G6/66a, 58/G8a are separate r bypass valves 134 and 136, respectively, with the same structure as described above.
．． It is equipped with 138. Air actuated part 144.146,1
48 actuate valve 1341 dish 36, +38, respectively.

Each hydraulic piston/crank and its corresponding water chutney combination constitute a separate pumping element that can be selectively disabled by a corresponding bypass valve.

The two-crank type pump illustrated in Figures 2 and 3 is a steam generator manufactured by Clayton Industries, Inc. ("Clayton"), the assignee of this publication. Sodel E-l 00 (S
It is described in the instruction manual for Leam Generator Model R-Knee 100).

A pump with only two bypass valves and four cranks is described in the Kraton instruction manual for the Steam Generator 11E-300 model. These two pumps are used in the present invention with two cranks and a corresponding bypass valve that constitutes one of the pump members. Other types of positive displacement pumps may be used with the apparatus. For example, if a suitable bypass valve is provided in the pump to selectively disable multiple cylinders,
Dual and triple plantar pumps manufactured by Orporation or Harrison may be suitable.

The table in Figure 4 shows the hydraulic oil bypass valve 116.134.13
6.138 represents how control is performed to correspond to six examples of different water supply demand amounts. In the first column of the table, where maximum water supply is required, all valves are closed, so that all pump members are operational. Pump 60 thus delivers water to the boiler at its maximum output.

The second column of FIG. 4 represents the operation of the bypass valve when the water demand is 80% of the rated output.

Valves 134, 136, 138 remain closed, but valve 1
16 opens and closes periodically, the particular period being selected depending on the acceptable fluctuations in steam pressure and the Fti wear that the valve can tolerate. In a boiler with a constant r6 output of 500 horsepower,
A period of 10 to 60 seconds, preferably a period of about 30 seconds,
I know it will bring good results. In the example in the second column of the table, valve 116 is operated at a 20% operating cycle. That is, for every 30 second cycle, the valve closes for 6 seconds and opens for 24 seconds. In this way, the cylinder 62. The pump member, consisting of piston 62a and water chamber 62b, is operable 20% of the time, inoperable 80% of the time, and produces 1/4 of its constant r6 output.

In this way, the pump 60 reaches its maximum constant output of 80
% will be generated.

In the example shown in FIG. 4, columns 3, 4, 5, and 6 of the table, the pump is at 65% and 5% of its rated capacity, respectively.
Activation is avoided at 0%, 35%, and 20%. Valve 11G
, 134, 136, and 138 are operated as shown.

In Figure 5, the bypass valve + 16,134°136
．． Microcomputer or microcontroller (central processing unit) to control 138! 62 is used. Central processing unit 162 and its associated circuitry are powered by a suitable +5 volt DC power supply +65.

An oscillator clock circuit 164 clocks the central processing unit 16 to provide the timing required by the internal functions of the central processing unit.
Connected to 2. A reset switch 161 is connected to the central processing unit so that the program can be restarted at any time. Digital display and keypad! 63a
is connected to the central processing bag rg, +62 in a known manner. Using the R5-232 serial input/output protocol,
The cathode ray tube terminal and the keyboard 163b are the central processing unit 16.
2 may be optionally connected. Programs for the central processing unit may be stored internally or in external program and data storage 166.

Furthermore, non-volatile calibration
A data storage device +67 may be used to store data entered by an operator through a keyboard or keypad. The parallel input/output controller unit 168 is used to output digital signals from and to the central processing unit via the parallel busline 82. As mentioned below, the digital output buffer/solid state relay assembly! 69 is used to directly interface to digital input/output coveredware. Analog data is obtained through analog to digital converter 160 and sent to central processing unit 162 according to instructions from the central processing unit.

The general operation of the control device shown in FIG. 5 is as follows. The increase in power to the device resets the central processing unit 162 and sets it to its initial state. The program then starts running and initializes the analog-to-digital converter i+60 and the parallel input/output controller I68 so that they can start in normal operating condition. The analog-to-digital converter 4160 then converts the potentiometer analog signal to a digital value and outputs the value to the central processing unit 162 to obtain constant -1 calibration data from the non-volatile calibration data storage.
The central processing unit is programmed to immediately obtain the position of the load potentiometer 43 by telling the central processing unit! 6
Request 2. The central processing unit then requests digital inputs from the run/best season switch 174 and the low burn start relay 175, represented by the opening and closing of the contact (tact). Since the run/fill switch 174 is a manual switch, the actuation sound can fill the boiler coil IO before the burner ignites. The operating sound can be made by holding the switch in the fill position for a predetermined period of time to ensure that the proper amount of water is in the boiler to prevent damage to the coil when the burner is ignited. Run/fill switch 174 controls low burn start relay 175 and prevents activation of low burn start relay 175 until run/fill switch 174 is moved to the run position. The low combustion start relay switches burner 20 to 2 in the “ON” position.
Or so that it is burned at an initial El1 rate of 0%. For use of run/fill switches and low-fire start relays in steam generator assemblies, see Claytono's Steam Generator E
More details are provided in the -100 series instruction manual.

With the run/fill switch and the low burn start relay set, the central processor +62 causes the parallel input/output controller 168 to output a digital signal to the digital human output Babfa/solid state relay 169. This digital human output buffer/solid state relay 169 connects the solenoid valve +82.
By actuating the combination 184, 186, 188 and the air pressure supplied to the air inlets 182a, +84a, 186a, 188a, the bypass valve 116.1311°13
6.138 is activated.

Valve 182. +84.186.188 each receives and receives the signal output from the input/output relay 169 and connects each corresponding air inlet 182a, 184a, 186a, 188.
a from the pressurized air supply source 190 to outside air. As shown in FIG. 3, air inlets +82a, 184a
, 186a.

188a are valleys, air actuating parts 124, 144, 146.
148. The maximum amount of water required is 100.
Decrease between % and 75%, 3 air actuated parts + 4
4.146, 148 and their corresponding bypass valves +
34, 136, 138 remain in the closed position as shown in FIG. Water demand from 75% to 50%
When the air pressure decreases during the period, valve +84 connects pneumatic actuator +44 to pressurized air source 190. Pressurized air source 190 forces a piston within air actuator 144 upwardly toward the spring, causing bypass valve 134 to open. This causes the cylinder 64. The pump member consisting of the water chamber corresponding to the piston 64a1 becomes inoperable. Water demand is 50%
and 25% respectively, the bypass valve 1
36.138 opens. When the run/fill switch 174 is in the fill position, water flowing from the pump 60 flows through the potentiometer 4.
The output signal of the solenoid valve L82.18L is such that it is proportional to the position of 3, but never less than 20% to ensure that the coil 10 is filled with water.
It is noted that this applies to 186.138.

As explained with reference to FIG. 4, the bypass valve 116, which is connected to the pump member consisting of the norinda 62° piston 62a and the water tanker 62b, is arranged so that the water supply demand is slightly adjusted, i.e., 75% or more, 75% or more. 50%, 50-25
%, it is operated so that less than 25% water can be supplied. To this end, the central processing unit program adjusts the operating cycle of valve 11G by applying the output signal from parallel input/output boat 168 to electrically operated pneumatic valve 182. When the output signal is on lead 193, valve 182 is air actuated! 24 to outside air. All other valves 1B2 connect the actuator to the outside air while keeping the valve 116 closed.

FIG. 6 shows the cylinder 62. The operation of the pump member consisting of a piston 62a and a water chamber 62b is illustrated. A high value of the pass represents pump filling operation when the bypass valve II6 is closed, a low value represents the pump is not operating with the bypass valve open.

After the program begins operating one or more solenoid valves, the program causes the computer to repeat the cycle just described and output data to the cathode ray tube 163b or digital numeric value 163a, and then to non-volatile storage. 167 to store specific data.

The specific operation of the control unit described above is further detailed in the following table, which describes the Benzke language program used in the central processing unit 162.

Program Table 1, Microcomputer - Vermic Language Program for Boiler Control System 003 The ellipsis (°) begins annotation.

Colons (:) separate commands.

005 °MLOOI)S is the number of times the real-time machine (central processing unit CPU) loops in 10 seconds.

010 °A(0)-A(4) is the solenoid valve (1
g2°+84.186.188) where m0 015 °h is the hexadecimal value or hexadecimal address.

A diagonal line (1) implies integer division.

020'TIMER is a timer based on M L 00 PS and measures the driving cycle time.

025°FLOW is the calculated water flow m (%) based on the output of the potentiometer 43 and the flow factor (FF).

030 "FF is the flow rate factor (%) of the maximum scale factor
Then, adjust the pump flow accordingly.

035°DUTY is the cycle time in seconds between one complete driving cycle.

040°POT is a digital value of the potentiometer 43, and 0-255 is the combustion amount (i.e., water demand) from 20% to 100%, respectively.

045'~IINACT is the minimum actuation time (in seconds) for the solenoid.

050 CYLON is pump 7 norinda 6 in output state
4. (Number of i6.6g. (Does not include cylinder 62, which easily forms a cycle.) 055 °ONTIME is the output cycle timer 060 °LFS when CYLON+1+J is in the output state.
is the low combustion start relay position.

0 means closed, meaning no combustion.

■ is open, that is, combustion.

065°I (FS is run/fill switch position.

0 is closed, Zunawara, execution.

1 is open, filling the solenoid valve.

070'I is a timer that prevents the solenoid valve from operating for, for example, 1 second during MENACT.

075 °BCYL is CYLON's old enemy value for comparison with CYLON's new loss value.

080°PP0RTx is a parallel human-powered 1-output boat (Summer 10169). Page; O is for command or l10169
Indicates the input to 1 in X is a solenoid valve (182, 1
84°186.188). X=2 indicates the command output to the analog-to-digital converter (AI) C) IGO, or denotal human power.

085 'PUNP is a command that commands pump action for the number of cylinders that perform pump action.

090 5BUF is the internal controller address of the last character received by the CPU from +63h.

2.171st period setting module +10 MLOOPS=10:A(0)=15A(1
)=7 ・A(2)=3: A(3)=1:A(
4)=0° mechanical loop and limit quantity.

+20 5BUF=99 h: FF=100:
DUTY=30: MENAC, T=I° Initialize input variables.

+25 PP0RTO=7000h: PP0RT
1=700 lh: PP0IIT2=700h ° Initialize the boat address.

130 PUMP=7: TIMER=O: L
FS=O: POT=0: FLOW=20aps
=s: MINACT=1 ° Initialize cylinder number I to 20%.

+40 POKE PP0RTO=91h:POK
E PP0RTl=PUNP.

Initialize the pump with 'Pr'0rtT.

145 GOTO 70° Do not allow input unless the operator manually presses the extended character (ESC) key.

150 1NI FUT Enter flow fac
tor (s 5-100%)”, FF °Water flow leveling factor 155 1F FF<85 0RFP>100GOT
Edit the O150° water supply factor.

160 INPUT Enter cycle ti
me (10-(its)”: DUTY °cycle time, name 1] is 20 seconds.

+65 IF DUTY<10 ort DU
TY>60 GOTO150 Edit the driving cycle time.

! 70 DU'l'Y=DUTY*MLOOPS/
Calculate the 10° actual cycle time.

180 MINACT=MIN'ACT)kM[,o
OPS/10 ゛Calculate the actual delay time.

3. Control loop module 200 TIMER=TIMEI? '-1: IF'I'I
MER>DUTY Tl-IEN TlλIER
= 1 ゛ Increment counter, if it is maximum, reset it.

210FLOW=FF*(20+lG*l]O'I'1
51)/+00 Calculate the flow from the analog-to-digital converter in %.

220 CYLON=FLOW/25ONTIME=
(Fl, 0W-CYI, ON*25)*DUTY/2
Loop CYLON+1 in the 5° output state. Calculate the cylinder number in the output state.

225 IF TMMER<=ONTIME T
HEN CYLON=CYLON+1° If O
If it is less than NTIME, aim for CYLON+1.

230 IF LFS=Oand RFS=OT
HEN CYLON=0: PRINT"No
FIRE” 'LFS Closed, do not run pump.

235 IF RFS=<>OTHEN PRW
T ``FrLLNG'''RFS open and fill the coil.

240 IF I=MINCT THEN I
If =°maximum, reset the delay.

245 1F I>OTHEN I=I+I:
GOTO 260° delay, therefore leave the cylinder in the output state.

250 IF BCYL<>CYL, ON T[
-1EN I=1 ゛New Norinda, therefore restart the delay.

255 PUMP=A(CYLON)° Norinda value=PtJMP 260 BCYL=CYLON Save CYLON for the next loop.

265 PRINT LOAD=”; (PO
T*100)/255: "%"FLOW-", FLO
W ° Print the numbers on the cathode ray tube.

270 POKE PP0RT2; O: P
OKE PP0RT2.80h: POKEPPOR
TI, P° address, analog-to-digital converter (ADC), conversion, pump command.

275 POKE PP0RT2. loh:CAM
=PEEK(PPORTO) °Enable and read analog-to-digital conversion 1 (ADC). (POT) 280 RFS=08h AND PEEK(P
P0RT2) &'Mask the RFS bit.

285 LFS=04h AND PEEK(P
P0RT2) 'Mask the LFS bit.

290 IF PEEK (SBUF)=027G
OTO150 'Enable ESC input.

295 GOTO200 ``Constantly loop.

300 5TOP °　If this is executed, consider it a mistake.

The above program table is self-explanatory. Lines 3 to 85 are non-executables (numerous nEMs in Basic) that indicate variables and functions.

Lines 110 to 180 are executable statements that process variables and functions. Each line is followed by a note 1 explaining the action of the statement in the line.

Lines 200 to 300 execute data acquisition, calculation, and control of the water supply pump 60. It should be noted here that the symbol * is used as a multiplicative signal. Therefore, the second
In row 10, constant 16 is multiplied by the digital value of potentiometer 43 and divided by constant 51. Add the constant 20 to the result, and then multiply the resulting value by the flow rate factor FF, which is usually set to 100%.
do. Divide the value obtained in this way by 100 to determine the water flow as a percentage. For example, if the output of the potentiometer 43 is set to the midpoint (half the output voltage of the potentiometer 43), i.e. -digital value 128, the water flow is calculated as follows.

-60% At 60% water supply, CYLON in row 20 is 60/25
ie, equal to 2, and ONTIME is equal to 12 seconds, given a cycle time of 30 seconds.

Additional analog-to-digital converters and digital inputs/outputs may be added to the
Additions may be made to the functionality illustrated, and program changes may be made to accommodate such hardware changes.

It will be appreciated, then, that words other than Beentz can be used to properly accomplish the same purpose as the Beentz program.

The computerized control system described above and shown in FIG. 5 is constructed from the following commercially available components. In order to optimally operate the control device, components may be replaced or supplemented with different components without departing from the purpose and scope of the invention.

Component Reference number - type lock (C1ock) in the pot! 64 M-TRON
MP-1+2 MllzUlgltal υr
spray)
A number of additional components are also required, such as resistors, capacitors, CPU* integrated circuits, connectors, sockets, printed wiring circuit cards, etc. This will be easily understood by a skilled engineer.

A method and apparatus for supplying feed water to forced circulation boilers and the like has been described in detail, which overcomes a number of drawbacks of the prior art. Various modifications to the preferred method and embodiment will be apparent to those skilled in the art, which will provide the correct amount of water and which do not depart from the inoperable condition.

Where one or more pump members are moving cyclically.
In this case, it is preferable for the pump members to operate in cycles, one after the other, rather than simultaneously. In further variants, only two pump elements can be cycled in a pump with two to four pistons, or six to eight pump elements can be activated in a pump with the same number of pistons. Additional data or output of additional digital commands may also be included to enhance the operation or functionality of the embodiments described above.

Therefore, the present invention can achieve its intended purpose by using the configuration as described in detail in the above embodiments.

[Brief explanation of drawings]

FIG. 1 is a diagram of a forced circulation boiler device to which the present invention is applied, FIG. 2 is a sectional view of a water pump used in the boiler device of FIG. 1, and FIG. 4 is a diagram showing the operation of the water supply pump of FIGS. 2 and 3 according to the present invention; and FIG. 5 is a diagram showing the operation of the water supply pump of FIGS. 2 and 3 according to the present invention. 6 is a block diagram of the automatic control device 7+1 of the water supply pump shown in FIG. 6, and FIG. 6 is a waveform chart showing the operation of one of the pump members of the water supply pump of FIGS. 2 and 3. FIG. 10...boiler, 12...inlet, 14 outlet,
16 - Combustion chamber, 18...Burner, 20 - Nozzle, 26... Supply pipe, 28... Fuel adjustment valve, 3
2. Motor, 38. Air blower, 43. Potentiometer, 44. Connection device, 50. Pressure vessel. Patent Applicant Clayton Manufacturing Company Representative Patent Attorney 2 people FIG/F/G6 "-1111"shi-111" L Procedural Amendment October 19, 1985 Japanese Patent Application No. 147619, filed in 1985 2) Name of the invention: Method and device for supplying water to forced circulation boilers 3, person making the amendment, relationship to the case Patent applicant address: 7° Meri, United States, Cali 7 Ornia 91735
-1530 Enoi Monte, Temple City Boulevard, 4213 Name: Clayton Manuf 7 Kuturing Company Nationality: United States 4, Agent address: 6, Honmachi Building, 2-10 Honmachi, Higashi-ku, Osaka, Osaka Prefecture;
Subject of amendment 7: The following parts of the detailed statement of amendment will be corrected. (1) On page 22, from line 17 to line 19, the phrase "replace each..." is replaced with [corresponding air inlets 182a, 184a,
186a. 188a is switched from outside air to pressurized air source 190. ] Correct. (2) Page 24, line 14, [Outside air ~182] is connected to the “pressurized air supply source” 90. 91. Valve 182 is corrected at all times. that's all

Claims (12)

[Claims] (1) In a water supply control device for supplying water to a forced circulation boiler or the like in which combustion gas is used to heat water, a positive displacement pump and a control means are provided, and the positive displacement pump further includes a water inlet. an outlet; a plurality of separate pump members each configured to pump a predetermined amount of water from the water inlet to the outlet during each cycle of the positive displacement pump; and a disabling means for selectively disabling the pumping action of the associated pump member, and the control means disables the water supply to the forced circulation boiler in conjunction with a water supply demand within a set range to the forced circulation boiler. at least one of the disabling means is controlled to selectively disable the pumping action of the associated pumping member in an operating cycle that varies in response to the water supply demand and at a predetermined periodic rate; A water supply control device characterized by: (2) In the water supply control device according to claim 1, each of the pump members includes a piston and a cylinder, and each of the disabling means includes a bypass valve, and the bypass valve is opened. Sometimes characterized by selectively disabling the pumping action of the associated piston and cylinder. (3) In the water supply control device according to claim 2, the positive displacement pump includes at least four pump members, and the control means periodically opens and closes one bypass valve at a time. A device characterized by being configured to do so. (4) In the water supply control device according to claim 3, the control means is configured to maintain one bypass valve in an open state when the water supply demand is within a first set limit. something that is characterized by being (5) In the water supply control device according to claim 4, the control means is configured to maintain the second bypass valve in an open state when the required water supply amount is within a second set limit. Something that is characterized by: (6) In the water supply control device according to claim 4, the control device is configured to maintain the third bypass valve in an open state when the water supply demand is within a third set limit. Something that is characterized by: (7) In the water supply control device as set forth in claim 5, the control means is configured to periodically open and close the fourth bypass valve in accordance with the requested amount of water supply. thing. (8) In the water supply control device according to claim 1, the forced circulation boiler includes a burner having a fuel regulator, and the control means is linked to the flow of fuel to the burner. Features. (9) In the water supply control device according to claim 1, each of the pump members includes a piston communicating with the first chamber, a cylinder, and a flexible diaphragm disposed in the second chamber. further comprising a piston for displacing the diaphragm by pumping fluid from the first chamber through the cylinder into the second chamber and for transferring water from the water inlet to the outlet; is characterized in that it includes a bypass valve, and when opened, the bypass valve selectively connects the first chamber and the second chamber to prevent movement of the diaphragm. (10) The fuel to the burner for heating the water in the forced circulation boiler is continuously controlled according to the desired amount of steam, and a plurality of separate A method for supplying water to a forced circulation boiler, a steam generator, etc., in which a positive displacement pump including a pump member is connected between the forced circulation boiler and the water supply source, includes a step of monitoring the flow rate of water required by the forced circulation boiler. , operating a positive displacement pump and disabling a predetermined number of pump members so that when the remaining pump members are operated continuously, the flow rate of water supplied slightly exceeds the required flow rate; step and at least one of the remaining pump components.
periodically disabling the pump member such that the ratio of the time the pump member is operable to the time the flow rate of water supplied by the pump member multiplied by one period is such that the pump member is equalizing the difference between the total required flow rate of water and the flow rate of water supplied by the remaining pump members that are operable at all times if operated at water supply method. (11) The water supply method according to claim 10, characterized in that only one of the remaining pump members is periodically inoperable at any time. (12) The water supply method as set forth in claim 10, characterized in that the period in which the one of the remaining pump members is made operable and inoperable is 10 to 60 seconds. .